another PST stage 2 mod
- pedro
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Re: another PST stage 2 mod
A few more images
Two different PST etalons + Coronados BF15 & BF10 ----> back distance from the etalon - 14/15cm
pst_stage2_mod_20180908-013 by Pedro Ré, on Flickr
pst_stage2_mod_20180908-009 by Pedro Ré, on Flickr
pst_stage2_mod_20180908-005 by Pedro Ré, on Flickr
pst_stage2_mod_20180908-002 by Pedro Ré, on Flickr
Two different PST etalons + Coronados BF15 & BF10 ----> back distance from the etalon - 14/15cm
pst_stage2_mod_20180908-013 by Pedro Ré, on Flickr
pst_stage2_mod_20180908-009 by Pedro Ré, on Flickr
pst_stage2_mod_20180908-005 by Pedro Ré, on Flickr
pst_stage2_mod_20180908-002 by Pedro Ré, on Flickr
Pedro Re'
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Re: another PST stage 2 mod
Hi Bart
I have a BIG soft spot with both etalons. Very different from my other H-alpha systems
I have a BIG soft spot with both etalons. Very different from my other H-alpha systems
Pedro Re'
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https://pedroreastrophotography.com/
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Re: another PST stage 2 mod
PST Mod (PDF file)
http://astrosurf.com/re/PST_Stage_2_Mod ... 180911.pdf
Ré, P. (2018). PST Stage 2 Modification. Pdf file (2000kB)
more articles at:
http://re.apaaweb.com/pdfs_articles.html
http://astrosurf.com/re/PST_Stage_2_Mod ... 180911.pdf
Ré, P. (2018). PST Stage 2 Modification. Pdf file (2000kB)
more articles at:
http://re.apaaweb.com/pdfs_articles.html
Pedro Re'
https://pedroreastrophotography.com/
https://pedroreastrophotography.com/
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Re: another PST stage 2 mod
Pedro,
In your excellent document (http://astrosurf.com/re/PST_Stage_2_Mod ... 180911.pdf), you mention the focus must come to a point 244mm from the rear of the rubber on the etalon. Where is that on your scope? The top of the diagonal? The middle of the eyepiece?
I've cobbled together a prototype yesterday using some pretty strange spare parts but it should work.
The other question is...I am using parts of a standard 2x barlow rather than the Glasspath. I've figured out the mounting in the prototype but does it need to be telecentric?
Thanks,
Jack
In your excellent document (http://astrosurf.com/re/PST_Stage_2_Mod ... 180911.pdf), you mention the focus must come to a point 244mm from the rear of the rubber on the etalon. Where is that on your scope? The top of the diagonal? The middle of the eyepiece?
I've cobbled together a prototype yesterday using some pretty strange spare parts but it should work.
The other question is...I am using parts of a standard 2x barlow rather than the Glasspath. I've figured out the mounting in the prototype but does it need to be telecentric?
Thanks,
Jack
Explore Scientific 152mm f6.5 achromat
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
12nm Filter
ZWO174 (IMX249 chip 5um)
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Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
12nm Filter
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation
- pedro
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Re: another PST stage 2 mod
The measurement was made by Ken Harisson:
Ken Harrison (2005). Modifying a Coronado PST Hα Solar Telescope (PDF file).
The PST etalon must be correctly placed. Final focus should be 225 mm behind the rubber ring of the etalon.
You can use other parts, a X2 barlow should work fine. It needs to be telecentric
Ken Harrison (2005). Modifying a Coronado PST Hα Solar Telescope (PDF file).
The PST etalon must be correctly placed. Final focus should be 225 mm behind the rubber ring of the etalon.
You can use other parts, a X2 barlow should work fine. It needs to be telecentric
Pedro Re'
https://pedroreastrophotography.com/
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Re: another PST stage 2 mod
Thanks, Pedro. I think my only confusion is where "final focus" is. I only use a video camera (no visual). Is that at the exit of the blocking filter? Or is it measured at the sensor chip? Or somewhere in between?
Best,
Jack
Best,
Jack
Explore Scientific 152mm f6.5 achromat
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
12nm Filter
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
12nm Filter
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation
- pedro
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Re: another PST stage 2 mod
Hi Jack
I tried several configurations and found out that a distance of 14cm from the rear of the PST etalon to the Coronado BF, works fine
solar_imaging_session_20180830-03 by Pedro Ré, on Flickr
PST_stage_2_mod_20180830-032 by Pedro Ré, on Flickr
I did not reduce the OTA's length (did not cut the tube)
regards
I tried several configurations and found out that a distance of 14cm from the rear of the PST etalon to the Coronado BF, works fine
solar_imaging_session_20180830-03 by Pedro Ré, on Flickr
PST_stage_2_mod_20180830-032 by Pedro Ré, on Flickr
I did not reduce the OTA's length (did not cut the tube)
regards
Pedro Re'
https://pedroreastrophotography.com/
https://pedroreastrophotography.com/
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Re: another PST stage 2 mod
Got it. And I also found the document you referred to so I should be good to go. The biggest difficulty seems to be finding an ok n-stock telecentric lens.
Jack
Jack
Explore Scientific 152mm f6.5 achromat
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
12nm Filter
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation
Aeries D-ERF
Quark Chromosphere f27 native, (f14 when focal reduced)
Mallincam .5x focal reducer (large format)
12nm Filter
ZWO174 (IMX249 chip 5um)
Huge Sense of Adventure Viewing Creation
- marktownley
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Re: another PST stage 2 mod
None of the lenses in this system are telecentric Jack - totally different thing!
http://brierleyhillsolar.blogspot.co.uk/
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Re: another PST stage 2 mod
I want returns to PST MOD2 because a few days ago arrived my TS 152/F5.9 and dont know how gets f10 for PST but have two ideas!
1.Buy Baader 1.7x Glasspath and will be have f10
2.I have Televue 2.0 Povermate 2x and can put front etalon but will be have F11.8
Which of the options will be the best????
Or maybe buy Lunt 50 with f7 and put Baader Glasspath 1.25?
What is the bandwidth of Pst and Lunt50? Pst 1A and Lunt 50 0,75A am right?
Thank you!
1.Buy Baader 1.7x Glasspath and will be have f10
2.I have Televue 2.0 Povermate 2x and can put front etalon but will be have F11.8
Which of the options will be the best????
Or maybe buy Lunt 50 with f7 and put Baader Glasspath 1.25?
What is the bandwidth of Pst and Lunt50? Pst 1A and Lunt 50 0,75A am right?
Thank you!
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Telescope: TS 152/900/Bresser 102/1350
Baader D-ERF 160MM
2xBaader 1.25 GPC
2xLunt 50mm
Lunt Cak B1200
Coronado BF15
Camera: Apollo Max 432M/ Apollo Mini 429M/Player One Mars II 462M/QHY 290MM
Mounh: 2xSky Watcher AZEQ6
Telecentric Lense: Televue Powermate 2/2.5x/4X/5X
https://www.astrobin.com/users/RamonLviv/
https://www.astroclub.kiev.ua/forum/ind ... ic=46758.0
Telescope: TS 152/900/Bresser 102/1350
Baader D-ERF 160MM
2xBaader 1.25 GPC
2xLunt 50mm
Lunt Cak B1200
Coronado BF15
Camera: Apollo Max 432M/ Apollo Mini 429M/Player One Mars II 462M/QHY 290MM
Mounh: 2xSky Watcher AZEQ6
Telecentric Lense: Televue Powermate 2/2.5x/4X/5X
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Re: another PST stage 2 mod
AR150/F6 works well with TV5x PWMT and Quark which is similar to PST. You get F30 and the details are OK.
I do not look at the sky with the eyes of an astronomer, but of a person looking for the beauty of nature.
- OlegLviv
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Re: another PST stage 2 mod
I dont want quark because a few years sold him dont like this device.
If you know pst wants f10 without vingetting and Lunt 50 wants F7.
But now want better choice for my AR150/F6.
If you know had old model Lunt 60T with colimator f4 and its a bad choice for my AR150/F6 mod......
My friend can give me for test PST MOD2 with 2.0 Powernate2x =F11.8 or can buy Baader Glasspath 1.7 lens=F10 but PST etalon has only 1A and think that Lunt 50 with Baader Glasspath 1.7=F7.2 will be better with 0.75A than PST MOD2.
Which of the options will be the best with my TS 152/F5.9 ? (contrast and sweet spot)
https://www.facebook.com/oleg.lavigne/
https://www.astrobin.com/users/RamonLviv/
https://www.astroclub.kiev.ua/forum/ind ... ic=46758.0
Telescope: TS 152/900/Bresser 102/1350
Baader D-ERF 160MM
2xBaader 1.25 GPC
2xLunt 50mm
Lunt Cak B1200
Coronado BF15
Camera: Apollo Max 432M/ Apollo Mini 429M/Player One Mars II 462M/QHY 290MM
Mounh: 2xSky Watcher AZEQ6
Telecentric Lense: Televue Powermate 2/2.5x/4X/5X
https://www.astrobin.com/users/RamonLviv/
https://www.astroclub.kiev.ua/forum/ind ... ic=46758.0
Telescope: TS 152/900/Bresser 102/1350
Baader D-ERF 160MM
2xBaader 1.25 GPC
2xLunt 50mm
Lunt Cak B1200
Coronado BF15
Camera: Apollo Max 432M/ Apollo Mini 429M/Player One Mars II 462M/QHY 290MM
Mounh: 2xSky Watcher AZEQ6
Telecentric Lense: Televue Powermate 2/2.5x/4X/5X